16639741 has 4 divisors (see below), whose sum is σ = 17363232. Its totient is φ = 15916252.

The previous prime is 16639717. The next prime is 16639759. The reversal of 16639741 is 14793661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14793661 = 41 ⋅360821.

It is a cyclic number.

It is not a de Polignac number, because 16639741 - 2⁵ = 16639709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16639741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16639771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361711 + ... + 361756.

It is an arithmetic number, because the mean of its divisors is an integer number (4340808).

Almost surely, 2^16639741 is an apocalyptic number.

It is an amenable number.

16639741 is a deficient number, since it is larger than the sum of its proper divisors (723491).

16639741 is an equidigital number, since it uses as much as digits as its factorization.

16639741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723490.

The product of its digits is 27216, while the sum is 37.

The square root of 16639741 is about 4079.1838644513. The cubic root of 16639741 is about 255.2988473733.

The spelling of 16639741 in words is "sixteen million, six hundred thirty-nine thousand, seven hundred forty-one".